Figure 4
From: Bilateral geochemical asymmetry in the Karoo large igneous province
Incompatible trace element compositions of parental North Karoo magmas normalised to non-chondritic primitive mantle50. Compositions of the least-contaminated CFBs (samples KO4-C-55 and OXB-54) and MORB-like dykes (P-dyke samples SA.19.1 and SA.20.1) from North Karoo show overall similarity and resemble basalts of the Ontong Java LIP (representative Kroenke and high-Nb type samples)70. Different incompatible element contents in Karoo and Ontong Java samples can be ascribed to different melting conditions. The Ontong Java LIP has been associated with melting of non-chondritic primitive mantle plume material (akin to PMNC in Fig. 3) rising from deep mantle49. Compositions of parental South Karoo magmas (D-picrite sample P27-AVL and E-picrite sample N356) are shown for comparison.
